Pimples on thighs can be caused by folliculitis, sebaceous cysts, hives or warts. 1. Folliculitis: Folliculitis is usually related to bacterial infection, and the main symptom is a red papule centered on the hair follicle, accompanied by pain. It can manifest as pimples on the thighs. 2. Sebaceous cysts: Sebaceous cysts are cystic swellings formed when the sebaceous gland ducts are blocked, leading to poor sebum excretion, the main symptom is that there will be lumps on the skin surface, the activity is usually large, but most usually have no clinical symptoms. 3. Urticaria: Urticaria is usually related to allergies, the main symptom is that the skin surface will have small bumps, usually itchy performance. 4. Warts: usually associated with human papilloma virus infection, the main symptom is that the local skin will have flesh-colored or white superfluous organisms. The actual pimples on the thighs are recommended to be actively regular hospitals, a clear diagnosis, and then targeted to deal with.