My skin has become much more sensitive to the sun since taking gabapentin and amitriptyline. I always used to tan evenly; now I get red and blotchy. Don't know if it's the combo of both meds or just one of them that's the cause of it. I don't go outside at any time of the year without strong sunscreen on, with a high % zinc oxide and/or titanium dioxide in it.
Faster tanning and tanning in unexposed areas can be a sign of Addison's Disease. You should mention this to your doctor. This falls under the heading of "Just because you have MS doesn't mean there isn't something else going on."
Bob
No - there is no relation to MS and tanning. You might be on drugs that make you more sensitive to the sun. Don't forget the sunscreen with UVA and UVB protection.