Hi dear, my grandmom has the same problem before too.
如果老人家身痕有好多原因, 他是沖完涼後痕, 還是整天在痕呢?
1)除了上述blog友講嘅原因, 又可能是食物敏感。
2)我見有D老人痴呆症的老人家都成日周身r, 其實同皮膚無關
3) Sorry to let u know that, one of the symptons of 淋巴癌是周身痕, 沒有任何原因的, My grandmom has the same case. She is sooo itchy all day day long. Before, we didn't know what's her problem and bring her to skin doctor, but the problem persisted. And at the very last stage, we found that there is a 腫瘤 in her 淋巴.
So afterall, please keep observe ur 老人家. And Bring her/him to doctor asap.