My guinea pig who is 4y old and a girl has been poorly in the past with bleeding and pain when pooing / peeing 1 year ago. She’s now a lot better and barely moans. (At one point she’d moan several times a day.) She doesn’t moan barely anymore maybe once or twice a day. But I just noticed she has two new bald patches on both sides. Should I be worried? It’s new I believe so can’t be linked to previous illness which was a year ago. Will it be a vitamin c deficiency when I googled it online? Or is it getting older age? Any ideas? Thanks for reading .