### Glossary of Common Skin Disease Terms - **Acne**: A condition where hair follicles become clogged with oil and dead skin cells, leading to pimples, blackheads, and whiteheads. - **Eczema**: A group of conditions that cause the skin to become red, itchy, and inflamed. Common types include atopic dermatitis and contact dermatitis. - **Psoriasis**: A chronic autoimmune condition that causes the rapid buildup of skin cells, leading to scaling on the skin’s surface. - **Rosacea**: A chronic skin condition that causes redness and visible blood vessels in your face. It may also produce small, red, pus-filled bumps. - **Vitiligo**: A condition in which the skin loses its pigment cells (melanocytes). This can result in discolored patches in different areas of the body. - **Melanoma**: The most serious type of skin cancer, developing in the cells (melanocytes) that produce melanin. - **Dermatitis**: Inflammation of the skin, often resulting in a red, itchy rash. It can be caused by allergies, irritants, or other factors. - **Alopecia**: The partial or complete absence of hair from areas of the body where it normally grows; baldness. - **Keloid**: A type of raised scar that grows excessively at the site of a healed skin injury. - **Hyperpigmentation**: Darkened areas on the skin caused by excess melanin production. - **Hypopigmentation**: Lighter areas on the skin due to a reduction in melanin production. - **Seborrheic Dermatitis**: A common skin condition that mainly affects your scalp, causing scaly patches, red skin, and stubborn dandruff. - **Hives (Urticaria)**: A skin reaction that causes itchy welts, which can be triggered by allergic reactions, stress, or other factors. - **Cellulitis**: A bacterial infection of the skin and tissues beneath the skin, causing redness, swelling, and pain. - **Impetigo**: A highly contagious bacterial skin infection that causes red sores on the face, especially around a child's nose and mouth. - **Warts**: Small, grainy skin growths caused by the human papillomavirus (HPV).