It is not recommended to go to a solarium before your MRI scan, which is a tanning bed that is more powerful than a normal one. The rays from the solarium can affect how clear the scan will be sometimes. It’s like taking a picture with a dirty lens – things might not turn out sharp. If you are worried about anything, you should avoid the solarium and speak to your doctor about any further concerns.

Sometimes not having enough vitamin D3 can cause people to lose their hair. You should keep taking the vitamin D supplement as the doctor told you. You should try to eat more foods that have iron and protein in them as well. One thing that might help is finding ways to relax when you are stressed. 

It looks like you have bad case of ringworm which did not respond to the OTC medicines. I suggest that as soon as possible you see a dermatologist who specializes in fungal infections. They may give you oral antifungal medicine and topical treatment to improve the result. Seek urgent medical care since untreated ringworm can cause problems.
 

Injuries can be the result of heat, chemicals, or sun exposure. Until then, keep the area clean and do not scratch it. The application of aloe vera or honey can help to relieve the scar. With time, it will become less noticeable, but be careful as scars are slow to vanish. It is not enough to wear a hat in the sun, make sure you also avoid getting darkened by it. 

Razor bumps in the bikini area are a common cause for concern. Injuries to follicles that occur through shaving are usually behind these bumps. They are typically red, itchy, and with small bumps. When ketoconazole cream does not help, another alternative is the use of a mild hydrocortisone cream that can help to control inflammation. Put on some lotion to the part all the time so it stays moisturized.