What home treatments can I use to sooth itching?

Try over the counter. Topicals: oatmeal bath, topical benadryl, (diphenhydramine) calamine lotion, 1% hydrocortisone, homeopathic florasone, aloe oral: sometimes it is due to an allergic response so you could also take an over the counter anti-histamine if the itching persists, get checked out as it could be something more serious.
Oat meal. Either a bath or place on affected area like a paste.