The irritation might be because of the brand of spermicide you are using. Try another kind if you want to keep using spermicide.
Still not working? If you are allergic to Nonoxynol-9, the main ingredient in many spermicides, you may need to check out another method. If you prefer something without hormones, external condoms (male), internal condoms (female), and the copper IUD could all be good options.
Try a different method: external condom (male), internal condom (female), IUD.
References:
- Society of Obstetricians and Gynaecologists of Canada. (2015). Canadian Contraception Consensus Chapter 5: Barrier Methods. JOGC Journal of Obstetrics and Gynaecology Canada , 37. Retrieved from https://www.jogc.com/article/S1701-2163(16)39376-8/pdf