Brazilian butt lift: can I remove fat from my arms if I have eczema?

Thank you for your question. Short answer is yes, you could have liposuction with eczema, I would recommend having a dermatologist see you before surgery just to be completely sure it's safe for you to proceed. In order to have best results, I would also recommend adding torso liposuction (360 liposuction including abdomen, sides, waist and back). This will provide enough fat to transfer and sculpture your shape. 

Regardless how big your arms may be there is no enough fat grafts there to create significant buttock augmentation. Fat grafts will have to be taken from other sites like lower abdomen, flanks, thighs. This surgery will, most likely, have no effect on your eczema to my knowledge. Photos would help as well as in person consultation with a PS with good reputation in fat transfer. Good luck.

A physical exam would be necessary to determine the extent of the eczema, but you can probably have all of these procedures due to the very small incisions needed and the likelihood that the areas of eczema can be avoided.