Rosacea is a chronic skin condition driven primarily by inflammation. While its exact etiology remains unknown, several micro-organisms inhabiting human skin are implicated in its development, including Demodex mites (which…

Bed bugs (Cimex lectularius) are parasitic insects belonging to the family Cimicidae. Typically reddish-brown in color and less than 1 cm in length, infestations have been increasing worldwide due to…

Lyme disease (Lyme borreliosis) is a multisystem infection caused by the tick-transmitted spirochete Borrelia burgdorferi. It is the most common vector-borne disease in the United States. Infection rates in ticks…

Angular cheilitis—also known as angular stomatitis, perlèche, or cheilosis—is a perioral infection caused predominantly by Candida species. In addition to infectious causes, anatomical and physical factors significantly increase susceptibility. For…

Cellulitis and cutaneous abscesses represent common skin and soft tissue infections caused predominantly by gram-positive bacteria. While both conditions share overlapping risk factors and pathogens, their clinical presentations, diagnostic requirements,…

Verruca vulgaris lesions, commonly known as warts, are caused by various strains of human papillomavirus (HPV) transmitted via direct person-to-person contact. Most non-genital warts stem from specific viral subtypes: While…

Accurate diagnosis of dermatological malignancies depends on detailed lesion descriptions and knowledge of typical anatomical sites of occurrence. Sun exposure represents the most potent risk factor for all types of…

Seborrheic dermatitis is a chronic, recurrent skin condition affecting areas with a high concentration of sebaceous glands, such as the scalp, eyelid margins, nasolabial folds, ears, and upper trunk. The…

Psoriasis vulgaris is a chronic skin disorder caused by accelerated mitosis and rapid epidermal cell turnover, leading to decreased cell maturation and abnormal keratinization. This rapid cell turnover prevents dermal…