I had same thing. Having a bit of work on my back. First 3 hour sitting healed great. Second 3 hour sitting nothing different used, 2 days after getting inked I had a rash around the tattoo. Red pimple like spots and really itchy!! Did not effect the tattoo itself went away within a few days. Recently had 3rd 3hour sitting and it’s now 3days after the rash has appeared again. Last time I thought it was bepanthen but didn’t use it this time. I’m not concerned as it doesn’t effect tattoo itself! Read somewhere that it’s due to the stress that the body has been through during getting inked. Really confused lol but sounds the same as yours. Glad it won’t just me! Lol 🙂