Can Allergies or Fungus Cause Hair Loss?

Noticed a small bald patch on beard. Today it's been growing and spreading into one really big patch under the chin and a small one the size of a dime about an inch away. It's obviously spreading.
Two things happen 6 months ago: came in contact with a dog with skin issues and  became a vegetarian. Anyone have an idea what this might be? Thank you. 

Doctor Answers 2

Allergies or Fungus May Cause Hair Loss

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Allergies or fungus may cause hair loss.  If you believe those are the causes it is best to see a doctor for a complete examination.

Los Angeles Hair Restoration Surgeon
5.0 out of 5 stars 106 reviews

Hair loss - alopecia areata

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This sounds for all the world alopecia areata. Often the tendency to develop this condition is inherited, in your case on the paternal line. This is condition is caused by our bodies producing antibodies or chemicals that are attacking and paralyzing the hair follicles. The white hairs in one of your patches is typical in that the hair has partially grown back. When it grows back it is usually at first white as the melanocytes, the pigment making cells, are at first weak. As they get stronger the more pigment is produced and the hair will grow in darker.

The treatment of choice is corticosteroid injections. Oftentimes it takes 2-3 sessions spread out every two months.

As I see it there are four options:

1) Find a sympathetic dermatologist who will give you a discounted rate my practice would be to charge for the office visit and perform the injections without cost)

2) Find a Free Clnic. In our area each city has one. The dermatolologists who volunteer are often quite good

3) Wait for the hair to grow back on its own. It usually does but this can take months.

4) Cut your beard.

Hope this has been of help.

Arnold R. Oppenheim, MD
Virginia Beach Dermatologist

These answers are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.