I've facing issue of sudden lump on forehead without any injury and maybe without any allergy. Sudden lump on same spot of forehead and disappearing in 10-12 hours, no major colour changes, no rash or itching, sometimes 2-3 on the same spot or less or even 4-5. It spreads for first 1-2 hours, then started disappearing over the next 10-12 hours. Please help me to find ou probable issues and reasons.