blue,
Ur boy's thighs and buttock got red spots but not like blister type rit? If not blister type, then mostly not HFMD.. Is ur boy having fever???
Last time when my girl got fever, she also developed red spots.. but once fever subsided, the red spots all gone..
My girl also kena HFMD when she was abt 2 yrs plus from her playgroup, but she only developed ulcers in her mouth.. n some red small blister like on her palms..
I think u should bring ur boy to consult PD..