You’ve pressed a microdart on and it stings. This page is the decision: leave it, take it off, or skip cones and stay with a plain hydrocolloid disc.
A hydrocolloid disc is the cheap round sticker, roughly 15–40p, for a whitehead or anything already weeping. A microdart is a small square of dissolving cones, typically £0.60–£2.50 or more each, for a closed early bump. They are not two strengths of the same sticker. If the spot is deep, painful, cystic, or it keeps returning, see a GP. A patch is not a cure.
The format fork is the hydrocolloid vs microdart comparison.
What a sting usually means
A microdart has tiny cones. A hydrocolloid disc is flat. Some people feel a short prick as they press the square on. A plain disc should not prick.
That brief prick does not mean the patch is working harder. Press once, on dry skin, then leave it.
Burning, itching, or a hot square that gets worse after the first minute is a different feeling. Take it off. Do not sit through the night to see if you get used to it. If the skin feels ordinary after that first press, leave it. If it still feels sharp, hot, or itchy, the trial is over.
Take it off if the sting stays
Peel from one edge, low along the skin. Do not rip it. If the edge tugs, wet it and wait a moment, then lift. Bin the patch. These are single-use. Do not stick it back on, and do not move it to a second bump.
Skin that looks more angry than the bump did, or a sting that is still there after the patch is gone, is a stop. Do not put another cone on that night.
See a GP if the area is more painful, swelling, or spreading, or if you feel unwell. The closed-bump guide is the wider list of when to stop.
When sensitive skin should stay with plain hydrocolloid
Stay with the cheap disc if your skin often reacts to plasters or sticky dressings. A microdart is still a sticky patch, and it adds cones. That is the dearer format to skip when glue already bothers you.
Stay with hydrocolloid if the spot has a white head, if you have already picked it, or if anything is weeping. A cone on open skin is the wrong job, and it is more likely to feel sharp there. The picked-spot guide covers the disc after a squeeze. It collects fluid. It does not undo the pick.
Stay off both formats tonight if a strong spot gel is already on that bit and the skin feels sore or tight. A sticker on a busy product is a common reason a patch stings. If there is surface fluid tomorrow and the skin is calmer, use a plain disc. If the bump is still closed, wait until the skin is calm before you open a cone.
If a round disc itches or leaves a sore rim, take that off too and leave the cone in the box. Read the warning box on a new pack. If it names something your skin already reacts to, leave the box on the shelf.
When a microdart is still worth opening
No white head, no broken surface, no leak, and skin you can leave alone once the patch is on. Skip it if the skin is freshly picked, raw from a gel, or already reacting to yesterday’s sticker. A clear hydrocolloid disc after six to twelve hours, or overnight, on dry skin is the usual clue the bump was still closed. That morning is the unchanged-bump guide.
Wash, wait until the spot is dry, and skip moisturiser, oil, serum, and SPF on that exact bit. Press once. The microdart apply guide shows the order. Leave it for six to eight hours, or overnight, only if it feels comfortable. If a brief prick settles, leave it. If the sting builds, take it off and save the rest of the box.
A microdart does not go white the way a hydrocolloid disc can. The white-centre guide is for the disc only. One comfortable night is the trial. If the first cone had to come off, that bump is done with cones for now. Under-eye ovals are a different format, at pounds a wear.
The same night, after you take it off
Wash with water or a plain cleanser. Pat dry. No second patch, no spot gel on the pink bit, and no picking at the rim where the glue sat.
If the spot is open or weeping and the sting has settled, a plain hydrocolloid can go on once the skin is dry. If you are not sure, wait until tomorrow. A 15–40p disc is a smaller spend than a second cone. If the bump is still closed, leave it uncovered until the skin is calm. The overnight hydrocolloid guide is the hold checklist: dry skin, no cream under it, press the rim, then leave it.
Where to buy in the UK
If your skin is sensitive, start with the cheap disc, not a box of cones.
Plain hydrocolloid is roughly 15–40p a patch, though pack prices move. COSRX Master Patch and Mighty Patch Original are the named sheets on this site. Boots, Superdrug, and Hero UK are on where to buy hydrocolloid patches.
For a closed bump on calm skin, Revolution Super Dart (Amazon UK) puts dissolving cones on a small hydrocolloid dome, often listed around £5.51–£9 for 9 patches. Skin Choice Classic Darts are the plainer square, often around £10.99, and Holland & Barrett stocks that range. Microdart patches here are typically £0.60–£2.50 or more each. More shops are on where to buy microdart patches, and the Super Dart explainer is the hybrid read.
More reading is in all guides. If you are still choosing a format, start with hydrocolloid vs microdart.