u/PracticeWestern4294

I have a guinea pig, and about three months ago, a bald strip appeared on his nose—I don't understand why. He also scratches quite often, though I haven't noticed any lice, redness, or sores from the scratching. However, I start itching when I hold him, whereas my mom doesn't itch when she holds him. Plus, he chatters his teeth... honestly, I just don't know what to do and I'm really worried. Should I take him to the vet? If so, could you recommend a specialist for rodents (ratologist) in St. Petersburg?