What are the common dermatological diseases?

Dermatological diseases include but are not limited to the following common types: 1. Viral Skin Diseases: Herpes simplex, chickenpox, shingles, common warts, flat warts, genital warts, molluscum contagiosum, etc. These diseases are mostly caused by viral infections and are contagious, spreading through direct or indirect contact. 2. Bacterial Skin Diseases: Impetigo, folliculitis, furuncles, carbuncles, erysipelas, cellulitis, etc. These infections are caused by bacteria and often manifest as redness, swelling, heat, and pain on the skin. Severe cases may present with symptoms such as pus formation and ulceration. 3. Fungal Skin Diseases: Tinea corporis, tinea cruris, tinea manuum, tinea pedis (athlete's foot), onychomycosis, tinea capitis, pityriasis versicolor, etc. These infections are caused by fungi and commonly present with lesions on the skin or nails, such as erythema, papules, vesicles, scaling, and itching. 4. Physical Skin Diseases: Sunlight dermatitis, heat rash (miliaria), corns, chilblains, light-induced dermatitis, hand and foot fissures, etc. These conditions are caused by physical factors and often manifest as erythema, edema, itching, and pain on the skin. 5. Parasitic and Insect-related Skin Diseases: Scabies, pediculosis, insect bite dermatitis, bee stings, venomous snake bites, etc. These conditions are caused by parasites or insect bites and contact, and often manifest as papules, vesicles, swelling, pain, and other symptoms on the skin. 6. Dermatitis and Eczema-type Skin Diseases: Contact dermatitis, neurodermatitis, prurigo, eczema, etc. These diseases often present with symptoms such as erythema, papules, vesicles, erosion, exudation, crusting, scaling, and itching on the skin and can be triggered by various internal and external factors.