Can hair loss be permanent after bleaching? Scalp is still numb 7 weeks later. Help!

It is not normal to have numbness after bleaching your hair.  Kenalog shots are not typical for treating chemical burns.

Bleaching the hair can cause chemical burns that may result in the loss of hair but the hair loss should not be permanent and usually will grow back. However, it may take a while for the hair to grow back. PRP would be a good option in the mean time to stimulate hair growth. 

Hair loss and thinning may be improved by a series of monthly PRP injections combined with Progesterone. I'd suggest seeing a professional in the field of hair loss to discuss the best treatment options for you. 

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I have had similar cases with bleach
and hair loss.   Sounds like you had a
mild chemical burn since you reported itching, burning, numbness and hair
loss.  There was no oozing, bleeding,
open wound or infection.     
Hopefully hair will regrow, time
will tell.  Steroids could reduce the
inflammation and help with recovery. Next time, get your hair colored NOT
bleached.  There is a difference.

I suffered the same fate and it takes a good 12 months to see what will grow back. I recommend seeing a hair restoration surgeon to have photos taken, so that you can be tracked and see what grows back and just how much. There are a few other options available to you, which can be recommended at a consultation.

there is nothing to do more other than wait and giving time to your body for repair mechanisms. that chemical burn may cause permanent hair loss and may need a hair restoration surgery . you will see the fate of hair in 6-10 months.

Bleaching your hair can cause 1st, 2nd, or 3rd degree chemical burns. 1st degree burns result in skin redness like a sunburn and can be itchy or painful but usually recover with no long term complications. However, there might be temporary hair loss that can take several months to recover. 2nd degree burns cause blistering, oozing, pain and may get infected. 3rd degree burns are deep, cause scabbing and often get infected. Both 2nd and 3rd degree burns can cause permanent scalp scarring and hair loss. You have done the right thing in seeing a dermatologist and should follow their advice.

This phenomenon is more common nowadays. Bleaching its safe for most people. But there are situations that arise where bleaching can injure the hair - or the scalp. Bleaching in rare situations may cause inflammation in the scalp, and sometimes scarring as well.  Scarring is quite rare - but it's the most feared complication of scalp injury because it can cause permanent hair loss. Indeed, for some individuals with these types of reactions, hair loss may be permanent.  I've written on this subject in the past. I can't emphasize enough the importance of getting prompt dermatologic attention with these types of reactions. 

Options include Kenalog shots, topical steroids, steroid shampoos, oral prednisone.  These treatments shut down inflammation and possibly scarring.