Using the healing brush tool, I press alt/opt and click on a great spot to use in the area that needs touching up and it looks good for about a second after I release the mouse button and then turns gray like it has a shadow. I can't figure it out. If I try to correct it it just gets worse. Can someone help please?
The Healing brush may not be the best choice. Also, is the blemish near the frame edge, or does it intersect two contrating areas? Try the Patch tool, but yu may get into trouble with that as well. Rather than spend ages explaining, can you upload a screen grab of the area you are trying to fix, so I (we) can give you a good answer without wasting a lot time?