Red rashes on the sides of your baby’s thighs may be caused by eczema, prickly heat, etc., and treatments vary. Common treatments include medication and daily care. 1. Eczema: red rash with itching may be eczema, can be used externally weak glucocorticosteroids, such as dinexed cream, while applying glycerine lotion to stop the itching, if the symptoms are serious, you can also take anti-allergy drugs, such as loratadine. Usually pay attention to the baby to wear loose and breathable clothes, avoid the baby scratching, do not use too hot water when bathing, and pay attention to apply moisturizing cream after bathing. 2. Prickly heat: If the weather is hot, it may be prickly heat, which can be treated with topical glycerin lotion to stop the itching. It is recommended to wear cotton breathable clothes, clean the skin every day, keep the skin clean and dry, and pay attention to the room temperature is not too high. Baby thighs on both sides of the red rash recommended that parents take the baby to the hospital dermatology consultation in a timely manner, for examination, clear diagnosis and then treatment. The above drugs should be used under the guidance of a doctor.