One should avoid showering until the effects of tingle remain. If the tingle lotion contains a bronzer, then you need to wait 4 to 6 hours to help the tan to develop on the skin before your bath fully. Most of the lotions will perform UV tanning, and it is not an artificial process so that it will trigger melanin production. So it is naturally going to make you dark. Sometimes to avoid overheating or sunburn and make the UV tanning process fruitful, people should take a shower after a few hours.