Hi
I am very sorry. Vet access for guinea pig owners in Canada is generally not very good; especially not in the Maritimes as we know from other members.
It looks rather like a case of self-barbering so the rather localised pain/discomfort could be sitting under the skin and not necessarily on it.
Overview
1 What is barbering?
2 Barbering other guinea pigs
- Social grooming
- Dominance grooming
3 Self-barbering
- Habitual over-grooming
- Stress
- Pain
4 Problems that can look similar to barbering
- Skin parasites and ringworm
- Hormonal problems and nutritional deficiencies
- Normal bald...
It doesn't look like a ringworm patch (fungal skin infection). Have you checked his hairs, especially the underlayers for tiny egg cases fixed to the hairs - when you feel it, it is like teeny beeds on a teeny string (hay mites). It is not a typical are area for mange mites, either. In this case you can sometimes feel tiny bumps in the skin (egg cases) and your piggy squirms when you touch a mange mites spot.
1 Vets and your customer rights
- What makes newly bought guinea pigs so vulnerable?
- Do I need to see a vet?
- Documenting illness and your customer rights
3 URI (Upper respiratory tract infection) and sensitivities
- Typical symptoms in order of development
- What to do immediately
- Sensitivity to hay dust and pollen
2 Ringworm (highly contagious fungal skin infection)
4 Species specific skin...
Thinning can sometimes point to a metabolic problem. How is his weight? Is it stable?
Can you feel a lump underneath?
Here are more things that a vet may check for:
Guinea Lynx :: Hair Loss