Dr Henry Lim, renown for expertise and research in photodermatology leads this issue of Dermatologic Clinics. Photodermatology in this issue addresses dermatoses brought on or accelerated by light as well as light forms for dermatology therapies. Photodermatology is used to diagnosis and treat many common conditions that bring patients to the dermatologist. Topics include: Introduction to photobiology; Evaluation of patients with photodermatologic conditions; Photoimmunology; Photoaging; Photocarcinogenesis; Polymorphous Light Eruption (PMLE); Actinic Prurigo; Hydroa vacciniforme and solar urticaria; Chronic actinic dermatitis; drug-induced photosensitivity; Cutaneous porphyrias; Photoaggravated dermatoses; Ultraviolet (UV) based therapy; Photodynamic therapy; Photoprotection. Dr Lim works with one his residents, So Yeon Paek, as his co-Editor on this issue.

People of African ancestry have sensitive skin and may suffer from a wide variety of skin disorders. Hair disorders are also common and differ from those suffered by Caucasians. This issue of the Dermatologic Clinics focuses on the most common skin and hair disorders seen in black skin, with articles focusing on acne scarring, alopecia, keloids, and skin pigmentation. There are also articles addressing moisturizers for the skin and the effect of hair treatments on the hair and scalp. Also discussed is the sociohistoric issues that can cloud the scientific understanding of clinical entities. Emphasis is often put on race and yet a very clear distinction should be made between race and quantifiable entities such as pigment and hair curl as determinants for skin/hair disease predilection; this is quite distinct from race as a surrogate for social class and a disease determinant for most medical conditions and malignancies.

Topics in this issue of Dermatologic Clinics include: Incidence and prevalence; Impact on quality of life; Special considerations of hyperhidrosis in children; Topical therapies; Iontophoresis; Botox for axillary hyperhidrosis; Botox for palmar/plantar hyperhidrosis; Botox for other hyperhidrosis; Systemic therapies for hyperhidrosis; Procedural approaches; Endoscopic thoracic sympathectomy; Emerging and investigative treatments; Resources for patients and physicians; Incorporating diagnosis and treatment into clinical practice. Dr David Pariser is Editor of this publication; a founding member of the International Hyperhidrosis Society and renown researcher and lecturer on mechanism, diagnosis, and treatment of hyperhidrosis, Dr Pariser continues to investigate therapies that are effective for patients.

This issue of Dermatologic Clinics, guest edited by Dr. Esther Freeman and Devon McMahon, will focus on COVID-19 and the Dermatologist. This issue is one of four selected each year by our series Consulting Editor, Dr. Bruce Thiers. Topics discussed in this issue include but are not limited to Covid-19 as it pertains to Dermatology Residency, Race in Dermatology, Dermatology Practice changes, Global Health Dermatology, Dermatologic Morphologies, Teledermatology, Dermatology Immunology, Occupational dermatology, Biologics, In-Patient Dermatology, Pediatric Dermatology, Registry Update, Dermatopathology, and Effect of COVID-19 on Delayed Skin Cancer Services. - Provides in-depth, clinical reviews on COVID-19 and the Dermatologist, providing actionable insights for clinical practice. - Presents the latest information on this timely, focused topic under the leadership of experienced editors in the field; Authors synthesize and distill the latest research and practice guidelines to create these timely topic-based reviews.

This issue of Dermatologic Clinics, guest edited by John E. Harris, MD, PhD, is devoted to Vitiligo. Articles in this timely issue include: History of Vitiligo Management; Quality of Life/Burden of Disease; Comorbidities/Systemic Effects; Skin Cancer Risk (NMSC/Melanoma); Presentations, Signs of Activity, Differential Diagnosis; Segmental Vitiligo; Chemical-Induced Vitiligo; Medical Therapy and Maintenance of Vitiligo; Phototherapy and Combination Therapies for Vitiligo; Surgical Therapy; Depigmentation Therapy; Special Considerations in Children with Vitiligo; Role of Diet and Supplements in Vitiligo Management; Genetics; Pathogenesis and Emerging Treatments; and Repigmentation/Melanocyte Regeneration in Vitiligo.

This issue of Dermatologic Clinics, guest edited by Elizabeth A. Buzney, MD, is devoted to Phototherapy. Articles in this important issue include: Nuts and Bolts: Optimizing Narrowband UVB Phototherapy Regimens for Psoriasis; The (Lost) Art of Managing PUVA Phototherapy; Distinguishing Myth from Fact: Photocarcinogenesis and Phototherapy; How Does It Work: The Immunology underlying Phototherapy; Phototherapy for Vitiligo; Phototherapy in Skin of Color; Phototesting Protocols and Interpretation and Managing Photodermatoses with Phototherapy; Utilizing UVA-1 Phototherapy; Using Phototherapy in the Pediatric Population; Home Phototherapy; Phototherapy for Cutaneous T-Cell Lymphoma; Creating and Managing a Phototherapy Center; Phototherapy for Itch; Beyond the Booth: Excimer Laser for Cutaneous Conditions; and Feeling the Burn: Phototoxicity and Photoallergy.

Viewing lesions using a dermatoscope helps the dermatologist distinguish between benign and malignant lesions. It is particularly useful in the early diagnosis of melanoma, which is the fastest growing cancer in the US and worldwide. This issue of the Dermatologic Clinics issue all of the important topics in dermoscopy, including differentiation of lesions, lesions in the young and older populations, and dermoscopy in general dermatology.

As baby boomers continue to age, demand for cosmetic procedures continues to rise. New techniques and products are constantly entering the growing market of cosmetic procedures, particularly lasers and fillers. Advances in the use of lasers, fillers, and botox are allowing dermatologist to better refine and customize treatments based on each patient’s cosmetic needs. This issue of ther Dermatology Clinics covers all of the latest information on cosmetic dermatology, including articles on fillers, lasers and cosmeceuticals.

Psoriasis is the most prevalent autoimmune disease in the U.S. • ~125 million people worldwide have psoriasis. Commonly misunderstood and interpreted as a “cosmetic problem, psoriasis is a complex and potentially debilitating disease; nearly 60% of people with psoriasis reported their disease to be a large problem in their everyday life. This issue of Dermatologic Clinics devoted exclusively to psoriasis is edited by two leaders of the International Psoriasis Council, Dr Alan Menter and Dr Chris Griffiths. Topics include: Genetics of psoriasis; Immunopathogenesis of psoriasis; Phenotypical expressions of psoriasis; Psoriasis as a systemic disease with multiple comorbidities; Outcomes measures in the assessment of psoriasis in clinical practice and trials; Update on topical therapies for mild to moderate psoriasis; Phototherapy and photochemotherapy (PUVA) for psoriasis; Current and future oral systemic therapies for psoriasis; Current biological therapies for psoriasis; Future biological therapies for psoriasis; Psoriatic arthritis for the dermatologist; Pharmacogenomics and the future of psoriasis therapies. This information that goes to the heart of clinical practice is equally appropriate, beyond dermatologists, for internal medicine clinicians, primary care physicians, bone & joint specialists; hematologists/oncologists, and researchers in genetic targeted therapy development.

This issue of Dermatologic Clinics, guest edited by Drs.Steven Feldman, Leah A. Cardwell, and Sarah L. Taylor is devoted to Rosacea. Articles in this issue include: Rosacea Pathogenesis; Genetic Predisposition to Rosacea; Epidemiology of Rosacea and Severity in the Population; Psychosocial Burden and Other Impacts of Rosacea of Patients’ Quality of Life; Comorbidities of Rosacea; Rosacea Triggers, Alcohol and Smoking; Clinical Presentation/Classification of Rosacea and Variation in Different Fitzpatrick Skin Types; Rosacea Treatment Review; Medical Management of Facial Redness in Rosacea; Procedural Treatments for Rosacea; Ocular Rosacea; Rosacea Treatment Cost; and Coping with Rosacea.