Tinea Corporis (Ring Worm) and Seborrheic Keratosis

00:03 As you recall, tinea corporis, also known as ringworm is a common fungal infection.

00:09 The risk factors for this are diabetes, HIV, obesity patients who have pets, and then moist areas or hygiene problems.

00:18 It is, of course, pruritic and our patient’s lesion was described as mildly itchy.

00:25 Most often, you'll see on exam singular or perhaps multiple raised, annular erythematous lesions.

00:32 It’s why it's called ringworm. It's annular type lesions with an irregular border, as we have in our patient central clearing and scale however.

00:41 Now, our patient is not seeing any evidence of scale on her lesion.

00:45 There may also be pustules with tinea corporis.

00:48 We treat it with a topical antifungal and it’s very readily treatable.

00:53 Well, we know that our patient does have some itchiness but still, this doesn't seem very likely based on the description and the image that we have.

01:00 I think we can safely take tinea corporis off of our list.

01:04 Let's move on to talk about seborrheic keratosis.

01:06 Now, this is a very common benign skin tumor.

01:11 There may be some hereditary features.

01:13 Patients whose parents had a lot of these lesions are very likely to develop it themselves and they tend to increase with age.

01:20 Sometimes, they're referred to as the barnacles of aging growing on the side of your ship as you get older.

01:26 They are described as exophytic.

01:28 Exophytic means that they are outwardly growing or growing out of the skin as opposed to infiltrating into the skin.

01:35 You'll oftentimes see terms like waxy or greasy.

01:39 They're brownish black in coloration and they're stuck-on in appearance.

01:43 That's again one of those terms you should look for on the boards.

01:46 They're papules, nodules, they may be plaques and they evolve very slowly over months to years.

01:53 Treatment is generally you just follow them or ignore them but if they're in particular areas where they're bothersome or maybe on a brow line or in a place where cosmetic appearance matters you can remove them with curettage or cryotherapy.

02:09 It doesn't sound like that's what our patient has.

02:11 She has a very flat lesion that has irregular borders and it's in a sun-exposed area so this doesn't really fit with seborrheic keratosis.

02:21 Let's take that one off of our list, too.