Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Get prompt medical help if the area develops signs of infection, such as increasing pain, warmth, swelling, pus, yellow crusting, or spreading redness.
Seek urgent care if spreading redness is accompanied by fever, chills, red streaks, severe pain, or feeling significantly unwell.
These symptoms are not typical of uncomplicated lichen simplex chronicus.
A rapidly changing, bleeding, ulcerated, or non-healing patch should also be assessed promptly.
Arrange a routine appointment if you have a persistent itchy, thickened patch, especially if it is interfering with sleep or daily activities.
An examination is important because several skin conditions can look similar.
Seek follow-up if treatment is not improving the patch, symptoms keep returning, or medication causes burning, skin thinning, stretch marks, or another unexpected change.
Genital or anal itching also deserves assessment because infections, allergies, and other skin conditions may need different treatment.
And for anyone, someone who:
Every sign above is quoted from the sofidex article on Lichen simplex chronicus. If you are not sure, err upward — it is always reasonable to be checked.