I would use it once a day , it comes in wash or an ointment , it could be an irritant itself , it drys the skin ......... I've never heard of using stridex , but I could see it as being worth a try also , it's ingredient is salicylic acid , it makes sense ........... I would think a vet would go the antibiotic and prednisone direction to do exactly what you said about "calming it down and starting fresh" , which sounds like a good idea to me ................as long as it's not too infected , without the vet i'd guess you could try some Benadryl and some topical cortisone cream and see if it calms it down .....some antibiotics if you have any sure wouldn't hurt , cephalexin would be a good safe choice .....good luck with your guy , i'm gonna guess he's pretty young and maturity will take care of it , it's probably his immune system acting up , maybe hormones ? or if it hasn't happened before maybe he did just lay his chin on something that irritated it ....