Thanks for the query posted .
I would be pleased to assist you with your query .
The raspeberry red mark can be a fungal infection
( tinea corporis
) , Nummular Eczema
You will need to moisturize it well and also can try applying over the counter canestan cream on that area .
For the pain that you have mentioned , it looks like muscular however it would be important to rule out certain neuritis related to the nerves.
You can try over the counter anti inflammatory like paracetamol
for a few days .
If it does not improve you might need to get certain investigations done .
Thanks and take care