A 90% TCA (trichloroacetic acid) peel is an extremely potent chemical peel that should only be used by trained professionals. TCA peels work by exfoliating the skin and promoting the regeneration of new skin cells, but at such a high concentration, it can cause significant damage if not handled properly.

 Important Points :

1. Professional Use Only : A 90% TCA peel is typically used for deep skin resurfacing and is not intended for home use. It penetrates deeply into the skin layers, which can result in severe burns, scarring, and complications if misapplied.

2. **Downtime : Recovery from such a deep peel can be lengthy, often requiring several weeks. The skin will likely scab, peel, and be extremely sensitive.

3. Preparation and Aftercare : Proper skin preparation and aftercare are critical. This may include using retinoids, moisturizers, and sun protection before and after the procedure. Aftercare usually involves keeping the skin moisturized and protected from the sun, as the new skin will be extremely sensitive.

4. Potential Risks : Risks include infection, scarring, hyperpigmentation or hypopigmentation, and prolonged redness.

5. Alternatives : For most individuals, lower concentrations of TCA (like 10-20%) or other types of chemical peels might be safer and more effective for their needs. These can still provide significant exfoliation and skin rejuvenation with less risk.

If you’re considering a peel, it’s best to consult with a dermatologist or licensed professional who can recommend the appropriate treatment for your skin type and concerns.