Thank you for your question and for submitting your photo. While it's impossible to make exact recommendations without assessing you in-person, it is unlikely that you will be able to improve the appearance of your birthmark with a TCA peel. Moreover, the skin on your torso is quite different from the skin on your face, and there is a high likelihood of scarring if you apply 35% TCA to it. Chemical peels, particularly those with higher strength acids like TCA, are a very complex procedure and require a great deal of expertise. If not applied properly, there is a relatively high risk of side effects and complications, including burns and permanent scarring. As a result, I strongly recommend against attempting TCA peels at home.
