How long should I wait to know if hypopigmentation after laser hair treatment will be permanent? (Photo)

I recommend following up with a cosmetic dermatologist. Hypopigmentation can be improved with lasers and microneedling/prp. See an expert. Best, Dr. Emer

It can take up to 2 years for hypo pigmentation to get better. Instead of avoiding the sun in those areas allow sun exposure but not between 10am to 4pm as that is when sun is very strong and you can get a burn. RegardsDr. Janjua

Thanks for your question and sorry that you are having the problem you are having.  It would be good to know which home device you used – and if it is one that has an FDA approval as there are many out there and many available and one should only use a home device in this country that has an FDA approval.  Most of what we have available here are safe and adverse effects like you are showing are rare.  I would find a board certified dermatologist in your area and see what they can offer for you at this time to attempt to get that pigment back.  Good luck.