Angular cheilitis—also referred to as angular stomatitis, perlèche, or cheilosis—is an inflammatory perioral condition localized to the commissures of the mouth. Driven primarily by opportunistic fungal (Candida) or bacterial infections,…

Cellulitis and cutaneous abscesses are prevalent bacterial skin and soft tissue infections (SSTIs) primarily driven by gram-positive cocci. Distinguishing non-purulent tissue involvement (cellulitis) from focal purulent fluid collections (abscess) is…

Verruca vulgaris (common warts) are benign epidermal hyperplasias caused by infection with non-oncogenic strains of Human Papillomavirus (HPV). Transmitted via direct skin contact or autoinoculation, clinical management relies on distinguishing…

Skin cancer encompasses precancerous dysplasias, non-melanoma skin cancers (NMSC), and cutaneous malignant melanoma. Early clinical identification through diagnostic mnemonics, prompt histological biopsy confirmation, and appropriate surgical or topical interventions are…

Seborrheic dermatitis is a common, chronic-relapsing inflammatory skin disease affecting sebum-rich areas of the head, face, and trunk. Driven primarily by an abnormal inflammatory immune response to commensal Malassezia yeasts,…

Psoriasis vulgaris is a chronic, immune-mediated inflammatory skin disorder driven by T-cell-mediated hyperproliferation of keratinocytes and incomplete cell maturation. Characterized by well-demarcated erythematous plaques covered with silvery scales, effective long-term…

Scabies is a highly contagious ectoparasitic infestation caused by the microscopic mite Sarcoptes scabiei var. hominis. Successful clinical eradication depends on precise diagnosis, immediate treatment of close household contacts, targeted…

Onychomycosis is a chronic fungal infection of the nail plate, nail bed, or matrix primarily caused by dermatophytes. While often viewed as a cosmetic concern, confirmation of fungal etiology prior…

Herpes zoster (shingles) results from the reactivation of latent Varicella-Zoster Virus (VZV) in dorsal root ganglia. Clinical management centers on initiating prompt antiviral therapy within 72 hours of rash onset,…