A skin allergy is a hypersensitivity reaction of the immune system to an allergen such as pollen, dander, dust etc. This leads to release of inflammatory mediators such as histamine, serotonin, bradykinin which leads to an inflammatory reaction. The allergy then manifests as a skin rash. Skin allergies are more common in infants with sensitive skin. Even irritants such as a dirty diaper, drool, food, soaps, and detergents can cause allergic reactions in children. As mentioned above, most skin problems resolve with time and can be treated at home too. However, in some cases, consulting a doctor becomes necessary. If your baby develops a skin allergy and the rashes worsen over time, you should take him to a paediatrician. Sometimes, a rash can also signify some illness – in this case, immediate medical attention is required. If your baby has a fever, is crying continuously, or is lethargic, you should consult Our Expert doctor in Hyderabad .