Are you sure it's a scab and not something stuck on to his skin? Can you post some photos? You can upload photos here https://www.beardeddragon.org/useruploads/ and then add them to your thread using the XIMG button.
OK that's definitely a scab or a growth of some sort. How long has it been there? Has it appeared to grow or spread? It may be healed over from an injury or it could be a growth. If it looks like it causes discomfort or if it looks like it's growing or spreading I'd bring him to an experienced reptile vet for an exam.
Just noticed it a couple days ago. Doesn't bother him to touch or anything. He is quite a jumper and explorer. Has little black/gray spots all along the underneath of his legs
I just set Swordtail's timer for his bath and paused it so I could actually fill his soaking bowl up and he crawled over my phone and canceled the timer
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!