head sores
疕 refers specifically to head sores or skin lesions on the scalp. Its meaning is narrow and medical, without broader abstract extensions.
疕 combines the sickness radical 疒 with 匕, but the exact historical role of 匕 is uncertain. It may have been a phonetic component or a simplified form of a more complex element.
The sickness enclosure 疒 wraps around 匕, which looks like a small spoon or blade. Picture a painful head sore being scraped or treated with a tiny tool.
For ヒ, imagine a head sore that makes you say 'hee!' in pain: hee -> ヒ, as you touch the sore spot.