| HOA | hip osteoarthritis; hypertrophic osteoarthropathy |
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| HOCM | high-osmolar contrast medium; hypertrophic obstructive cardiomyopathy |
| HPA | Health Care Practice Act; Health Policy Agenda for the American People; health promotion advocates; ... |
| HPO | high-presure oxygen; hydroperoxide; hydrophilic ointment; hypertrophic pulmonary osteoarthropathy |
| HPOA | hypertrophic pulmonary osteoarthropathy |
| lichen strophulosus | An eruption of papules and vesicles at the orifices of sweat glands, accompanied by redness and inflammatory reaction of the skin. Synonym: heat rash, lichen infantum, lichen strophulosus, prickly heat, strophulus, summer rash, tropical lichen, lichen tropicus, wildfire rash. (05 Mar 2000) |
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| lichen syphiliticus | Secondary eruption of small follicular papules, usually appearing as groups of lesions. Synonym: acuminate papular syphilid, lichen syphiliticus, miliary papular syphilid. (05 Mar 2000) |
| lichen tropicus | An eruption of papules and vesicles at the orifices of sweat glands, accompanied by redness and inflammatory reaction of the skin. Synonym: heat rash, lichen infantum, lichen strophulosus, prickly heat, strophulus, summer rash, tropical lichen, lichen tropicus, wildfire rash. (05 Mar 2000) |
| lichen urticatus | A sensitivity reaction to insect bites, especially human and pet fleas, seen mostly in young children as wheals followed by papules on exposed areas. Synonym: lichen urticatus, prurigo infantilis, urticaria papulosa. (05 Mar 2000) |