英和和英

swelling

come out in a rash

roseola―rose-rash

slight swelling of an organ or part

eruptive typhus

a disease called herpes

inflammatory condition of the skin, called eczema

a skin disease called nettle rash

an inflammatory condition of the skin, called {popular eczema}

a skin condition called intertrigo

rash on the skin called roseola

a Japanese endemic called Japanese river fever

I have a skin eruption.

any of various vesicular skin diseases, tetter

I have hives.

A rash broke out.＝I broke [came] out in a rash.

a medical symptom called toxic rash

a disease called roseola

I got a rash.

What about the rash?

an eruption with vesicles

pityriasis in which an itchy rash develops over the trunk and extremities

I sometimes get rashes.

{ecxema} on the skin caused by perspiration

I got a rash.

of a rash that resembles that of measles

a contagious disease that causes eruptions on the skin, called German measles

I have a rash on my neck.

a rash symptomatic of scarlet fever

The rash is, um, also incredibly contagious.