Children with red rashes on the inner thighs can be considered to be related to conditions such as contact dermatitis, eczema or toddler emergency rash. 1. contact dermatitis: such as diaper dermatitis, and diaper replacement is not timely or diaper special material related, can lead to the child’s perineum area and around the urine decomposition of ammonia stimulation, diaper dermatitis, manifested in the skin redness, there may be spot papules or pimples appear. 2. Eczema: when the child’s inner thighs contact with certain substances or food ingestion triggered by allergies, can be formed locally on the basis of erythema pimples, papules or blisters, there may be itchy symptoms. 3. Early childhood emergency rash: also known as infantile roseola, the child may have a sudden onset of fever, body temperature rises in a few hours, when the body temperature is normal, rose-colored maculopapular rash can appear, in the limbs, face and other places are distributed. When you find a rash on your child’s body, it is recommended that you seek medical attention in a timely manner and follow the doctor’s instructions for treatment.