Size of lesions	Conditions
Pinpoint	Folliculitis
	Keratosis pilaris
	Scarlet fever*
1 mm to 1 cm	Guttate psoriasis
	Insect bites†
	Lichen planus
	Miliaria rubra (i.e., prickly heat, heat rash)
	Rocky Mountain spotted fever*
	Roseola (i.e., exanthem subitum, sixth disease)
	Rubella*
	Scabies
	Varicella*
1 to 25 cm	Lyme disease*
	Nummular eczema
	Tinea corporis
	Urticaria (i.e., hives)
Variable	Atopic dermatitis
	Contact dermatitis
	Drug eruption*
	Erythema multiforme
	Fifth disease (i.e., erythema infectiosum)*
	HIV acute exanthem*
	Kawasaki disease*
	Meningococcemia*
	Pityriasis rosea
	Psoriasis (plaque psoriasis)
	Seborrheic dermatitis
	Secondary syphilis*
	Staphylococcal scalded skin syndrome*
	Stevens-Johnson syndrome*
	Toxic epidermal necrolysis*
	Viral exanthem, nonspecific
Erythroderma possible	Atopic dermatitis
	Drug eruption*
	Psoriasis (plaque psoriasis)
	Sézary syndrome (i.e., chronic cutaneous T-cell lymphoma)
	Toxic shock syndrome*