Itching and small bumps in the armpit, consider the following possibilities: 1, armpit ringworm: caused by fungal infection, you need to test the fungal test before treatment, if it is positive is armpit ringworm, you can take oral terbinafine hydrochloride tablets, itraconazole capsules, topical terbinafine hydrochloride spray, or terbinafine hydrochloride gel, or naftifine ketoconazole gel (cream). 2, eczema: mainly due to allergies, such as Newly bought clothes are not washed, after contact with this allergy, you can take oral Zocetrizine Hydrochloride tablets or Olopatadine Hydrochloride tablets, loratadine tablets, topical application of mometasone furoate cream or hydrocortisone butyrate cream, dinaide cream. Avoid spicy and irritating diet and alcoholic beverages in your daily life.