What are the common diseases in dermatology?

Dermatology covers a wide variety of common diseases, primarily categorized into the following major groups: 1. Inflammatory Skin Diseases: Such as dermatitis, eczema, and urticaria. These conditions are typically accompanied by symptoms such as redness, swelling, and itching of the skin and are frequently seen in dermatology outpatient clinics. 2. Infectious Skin Diseases: Including bacterial infections (e.g., folliculitis, furuncles), fungal infections (e.g., tinea pedis, tinea cruris), and viral infections (e.g., herpes simplex, herpes zoster). These diseases are mostly caused by pathogenic microorganisms and are contagious. 3. Erythematosquamous Skin Diseases: Such as psoriasis (commonly known as scaly psoriasis). These diseases mainly present with skin erythema and scaling and are often characterized by recurrent episodes. 4. Connective Tissue Diseases: Such as systemic lupus erythematosus and scleroderma. These conditions are autoimmune diseases that can affect both the skin and multiple internal organ systems. 5. Sexually Transmitted Diseases: Such as syphilis, genital warts, and AIDS. These diseases are primarily transmitted through sexual contact and can have serious impacts on both skin and overall health.