I’ve been using Tretinoin 0.05% gel since 9/1/18. Recently reacted. What can I use OTC to get rid of the rash? (photos)

Thanks for your question and posting pictures.  Tretinoin, retinols and Retin-A can be irritating to your skin.  We tell our patients to reduce how often they apply it nightly.  If you take a break for a couple of days, your face should clear up.  When you restart, apply every other night for a week.  If that goes well, slowly increase the number of nights that you apply it.  I hope this helps.