The past few days i've been noticing that i'm developing a callus on the side of my strumming hands thumb. It's likely because i've been practising my sweeping and just general shredding a lot more these past few days and the side of my thumb usually does a lot of muting whilst i sweep etc.
I was wondering if any other players have had this occur or is it natural when practising sweeping in particular?
If your thumb is doing a lot of the muting, then it's fair that you develop a callous.

I'm starting to get callouses on all my fingers on my picking hand from fingerpicking. All natural, man.
Quote by Kensai

Awesome guy right here