What Are the Infectious Skin Diseases?
Dec 12, 2021
Source: Cainiu Health
Dr. Liu Wan
Introduction
Dermatological diseases refer to a broad category of disorders affecting the skin and its associated appendages. As the largest organ in the human body, the skin can manifest signs of numerous internal diseases; thus, dermatological conditions are highly diverse. Etiologies of skin diseases are varied—for instance, infectious agents can cause conditions such as leprosy, scabies, fungal infections, and bacterial skin infections, many of which are contagious.
Skin diseases encompass a wide variety of conditions. Most skin diseases are contagious to some degree and are typically transmitted through direct person-to-person contact—for example, while bathing together in public bathhouses or sharing clothing. Contagious skin diseases include herpes, systemic lupus erythematosus (SLE), syphilis, gonorrhea, and filariasis, among others. So, which skin diseases are actually contagious?
Which Skin Diseases Are Contagious?
Dermatological disorders refer collectively to diseases affecting the skin and its associated structures (e.g., hair, nails, and glands). As the largest organ of the human body, the skin may manifest signs of numerous internal diseases. Etiologies of skin diseases are diverse: infectious causes—such as leprosy, scabies, fungal infections, and bacterial skin infections—often carry transmissibility, posing not only health risks but also psychological distress and social stigma. Fortunately, with improvements in living standards and advances in science and technology, infectious diseases like leprosy have been significantly controlled worldwide. Other intrinsic and extrinsic factors—including mechanical, physical, chemical, biological, endocrine, and immunological influences—are receiving increasing attention in dermatology.
Viral skin diseases: Examples include common warts, flat warts, genital warts (a sexually transmitted infection), varicella (chickenpox), rubella, measles, molluscum contagiosum, hand-foot-and-mouth disease, and foot-and-mouth disease—all of which can spread via direct contact or respiratory droplets.
Bacterial skin diseases: Certain bacterial infections—such as impetigo, leprosy, and cutaneous tuberculosis—are also contagious and may be transmitted through direct contact.
Fungal skin diseases: Superficial mycoses caused by dermatophytes are almost universally transmissible through contact. For instance, tinea capitis (scalp ringworm) may spread via shared hairdressing tools, while tinea pedis (athlete’s foot) and tinea manuum (hand ringworm) can be transmitted through shared footwear or socks. Other examples include onychomycosis (nail fungus), tinea corporis (body ringworm), tinea versicolor (pityriasis versicolor), and candidiasis (e.g., oral thrush).
Sexually transmitted infections (STIs): STIs such as gonorrhea, syphilis, and HIV/AIDS are primarily transmitted through sexual contact.
Others: Scabies—caused by the Sarcoptes scabiei mite—and pediculosis—caused by lice (including head lice, pubic lice, and body lice)—are highly contagious.
Therefore, patients diagnosed with any of the above contagious skin diseases should practice appropriate isolation to prevent transmission to others. Healthy individuals should likewise avoid close contact with affected persons and refrain from using their personal items (e.g., towels, clothing, or grooming tools) to reduce infection risk.
We hope this information is helpful to you. Wishing you good health and happiness!
