Had itchy bumps for a week now after going biking w/ sunscreen. seem to be clear/flesh colored until i scratch them and they turn red. is it heat rash?

Maybe: "heat rash" is a pretty non-specific term. The fact that the bumps have lasted a week or so means it's probably something a little more significant. The rash could be allergic in nature, whether to the sunscreen or something environmental. A trial of topical steroid cream, like hydrocortisone, may help, but if it doesn't improve in the next few days, i'd have it checked by your doctor.

Not sure where?: I'm not sure where your rash is and so it is almost impossible to give you an answer. Yes it it possibly a heat rash. But after a week, that should have gotten better. Please see your family doctor or dermatologist. Be well, .