Ointment staining underwear: how to keep creams and suppositories off

Ointment staining underwear is one of those small laundry facts nobody mentions until a pair of briefs comes out of the wash with a gray, greasy outline. The cause is simple: most ointments, creams and suppositories have an oil or wax base, and oil moves into fabric faster than you'd like.
Short answer: use a thin layer, give the product a few minutes to settle, put a thin disposable liner inside your underwear as a barrier, and treat any mark with detergent before the garment goes near a dryer.
(Wearing your oldest underwear is also a legitimate strategy. Nobody has ever been graded on it.)

Ointments and creams stain because their base is oily, and oily marks bind to fabric fibers instead of rinsing out with plain water. Manufacturers say so openly. The DailyMed label for a 40% zinc oxide paste (Kenvue Brands LLC) carries a note that the product may stain clothing.
Suppositories add a second mechanism. They are designed to melt at body temperature, so some of the melted base can come back out. The pharmacist-reviewed medicines guide from Healthify (New Zealand, updated October 2024) says a suppository may leak a little and suggests wearing protective clothing or absorbent pads in your underwear as a precaution.
Two things follow. A stain doesn't mean you used the product wrong, and a bit of seepage isn't unusual. It is just physics plus cotton.

Use less product, let it settle, and put a barrier between the product and the fabric. The steps below work for most creams, ointments and gels. Where your label or prescriber says something different, follow them.

1. Apply a thin layer. For topical steroids, the Guy's and St Thomas' NHS Foundation Trust patient guidance describes a thin, glistening layer, not a thick coat. A thinner layer also means less product available to transfer to fabric. That second part is plain logic, not a quote from the source.
2. Give it a few minutes before you dress. Check the label for any waiting time. If there isn't one, a few minutes with your underwear still off lets the surface settle.
3. For suppositories, stay lying down for a short while. Healthify advises lying down for a few minutes so the suppository can melt.
4. Add a liner. A thin disposable liner or pad worn inside underwear takes the first contact, so the product ends up on the pad, not on the garment. It works by absorbing and holding moisture and oily residue. Change it when it's marked.
5. Pick the underwear for the day. Darker or older pairs hide a mark if one gets through.
6. Keep a spare pair and a liner in your bag. This costs almost nothing and removes the "now what" moment.

Treat the stain before drying: blot off the excess, pretreat with detergent, wash in the hottest water the fabric allows, and check the spot before the dryer. Heat sets oil.
This is the standard method for greasy marks, including petroleum jelly. The University of Georgia Cooperative Extension textiles guide for grease and petroleum jelly stains gives these steps for washable fabrics, and Tide's grease stain guide (Procter & Gamble) agrees on the key points.

1. Remove the excess. Blot or lift off what sits on the surface. UGA Extension suggests absorbing grease with talcum powder and brushing it off. Tide suggests pressing paper towel on both sides of the mark.
2. Pretreat. Work heavy-duty liquid detergent or a commercial pre-wash stain remover into the spot. Tide notes that liquid detergent does better than powder on greasy marks.
3. Wash in the hottest water the fabric allows. Check the care label first. Test any stain remover on a hidden area.
4. Check before drying. Both sources say drying sets the stain. If the mark is still there, repeat steps 2 and 3.
5. If a mark went through the dryer, Tide suggests clear dish soap worked into the spot, a rinse, a soak in warm water, then another wash.

One honest caveat: we did not find laundry instructions published by the makers of zinc oxide products. The grease method above is the closest published guidance, and it is not specific to those products.

A suppository may leak a little as it melts, and the practical fix is an absorbent pad in your underwear plus a short rest after use. That is Healthify's guidance, and it needs no more explaining than that.
Ask your pharmacist about timing and what to expect from your specific product.

A thin disposable liner can catch cream leaking underwear before it reaches the fabric, but it is a barrier, not a seal, so placement and replacement matter. The comparison below shows what each common option does and where it stops.

If a thin liner sounds like the right fit for your day, see how it works, or check the liners FAQ. (It takes about as long as putting a watch on.)