Red bumps on the outer thighs are considered as follows: the first possibility is contact dermatitis, mainly due to an allergic reaction caused by the application of creams on the outer thighs, which can appear as well-defined edematous erythema with tiny bumps, and some of the bumps can fuse into patches, accompanied by itching. In clinical treatment, oral loratadine capsules can be taken once a day, one capsule at a time, and a 2% boric acid solution can be applied twice a day. After the wet compress, when the redness has diminished in color, topical denuded ointment can be applied twice a day. In the second case, tinea corporis is more likely to appear as a ring-shaped red spot with small bumps, slightly raised edges, fine scales, and itching. This is mainly caused by fungal infection, which may be transmitted from the hands and feet to the outer thighs. You can apply topical terbinafine hydrochloride gel or luliconazole ointment for treatment.