30/05/2026
COMMON TYPES OF SKIN LESIONS: Simple Clinical Guide .
Identifying skin lesions is the first key step in diagnosis. They are split into primary (new, direct changes from disease) and secondary (changes from scratching, infection or healing). Knowing their look, size and texture helps tell apart allergies, infections or other skin conditions.
📌 PRIMARY SOLID AND PALPABLE LESIONS
Solid, raised or thickened areas, no fluid inside
• 🔴 Erythema (Red patch) Flat red area, caused by widened blood vessels and increased blood flow from inflammation or reaction.
• 🛑 Papule, Small solid bump 1cm wide; grows deep under the skin, feels solid and fixed in place.
• 🛡️ Plaque, Raised, flat-topped, scaly patch >1cm wide; thickened skin layer, common in conditions like psoriasis.
📌 PRIMARY FLUID-FILLED LESIONS
Contain clear fluid, pus or blood inside
• 🫧 Vesicle (Small blister) Tiny bubble 1cm wide; from burns, severe allergies or autoimmune issues.
• 🧪 Pustule. Bump filled with white/yellow pus; full of infection-fighting cells, seen in bacterial or fungal infections.
• 🩸 Blood blister, Blister filled with red/dark blood; caused by injury or friction breaking small blood vessels.
• 🦟 Wheal / Hive, Raised, itchy, swollen patch; comes and goes fast, caused by allergic reactions releasing histamine.
• 🎈 Cyst, Closed round sac deep in skin; filled with fluid, thick material or keratin, often smooth and sometimes tender.
📌 SECONDARY LESIONS: CHANGES AND SKIN DAMAGE
Formed when skin is injured, scratched or healing
• 🕳️ Ulcer, Open sore where top skin layers are lost; may go deep, heals slowly and usually leaves a scar.
• 🍂 Crust, Hard, dry layer over a wound; made of dried blood, fluid or pus, forms as part of natural healing.
🩹 IMPORTANT CARE AND SAFETY TIPS
✅ See a dermatologist if any lesion lasts longer than 4 weeks, changes shape/colour or looks unusual.
❌ NEVER pop blisters or pick scabs, this damages skin protection and causes serious infection.
🧼 Keep skin clean and moisturised to help it heal faster and keep its natural protective barrier strong.
🚨 Go to a doctor quickly if you see spreading red lines, increasing pain, heat, swelling or fever, these are signs of dangerous infection.
Nurse Chinel ❤️.