Witchmark / C.L. Polk.

Magic marked Miles Singer for suffering the day he was born, doomed either to be enslaved to his family's interest or to be committed to a witches' asylum. He went to war to escape his destiny and came home a different man, but he couldn't leave his past behind. The war between Aeland and Laneer leaves men changed, strangers to their friends and family, but even after faking his own death and reinventing himself as a doctor at a cash-strapped veterans' hospital, Miles can't hide what he truly is. When a fatally poisoned patient exposes Miles' healing gift and his witchmark, he must put his anonymity and freedom at risk to investigate his patient's murder. To find the truth he'll need to rely on the family he despises, and on the kindness of the most gorgeous man he's ever seen.