A firm lump in the scar after hand surgery is usually NORMAL SCAR THICKENING. It peaks around six to twelve weeks and softens over the following months.
Less often it’s a stitch working its way out, a raised hypertrophic scar, a small cyst, or a tender nerve ending called a neuroma.
A lump that is red, hot, weeping or getting more painful is different. That points to infection and needs checking the same day.
Why scars go lumpy
- Healing lays down collagen fast and untidily. In the first few months the scar feels thicker, firmer and wider under the skin than it looks on top
- Palms scar thicker than most places because the skin is thick and anchored down
- Remodeling takes months. The collagen gradually reorganizes, and the lump flattens and softens over three to twelve months or more. See scar management
A scar that feels lumpy at eight weeks is usually a scar doing its job untidily. Time and pressure tidy it up.
What the lump could be
- Normal scar thickening: firm, along the length of the scar, not red or hot, gradually softening. The most common cause
- A stitch working out: a small, red, pimple-like bump on the scar line a few weeks after surgery, sometimes with a thread visible. An absorbable stitch the body is pushing out
- Hypertrophic scar: raised, red and firm, but staying within the line of the scar
- Keloid: spreads beyond the original scar edges. Less common, and more likely in darker skin and in people who’ve had keloids before
- Inclusion cyst: a smooth, round, pea-sized lump that appears weeks to months later, where a little skin was tucked under during healing
- Neuroma: a very tender spot that gives an electric shock when tapped, from a small skin nerve healing in a tangle
- A lump that returns where one was removed, such as a ganglion
- Heel-of-palm tenderness after carpal tunnel release, which is pillar pain rather than a lump
A quick check at home
- Bend and straighten the finger. If the lump moves with the tendon, the scar may be stuck to the tendon underneath
- Tap it lightly. A sharp electric shock suggests a neuroma
- Look at the color and feel the warmth compared with the rest of the hand
- Photograph it weekly in the same light. Most scar lumps look smaller month on month
What helps
- Scar massage once the wound has fully closed, usually from around two to three weeks. Firm circles, several minutes, a few times a day
- Silicone gel sheets or gel, worn for many hours a day for a few months, for thick or raised scars
- Gentle pressure from a padded glove or tape for thick palm scars
- Desensitization for tender scars: tapping and rubbing with different textures, several times a day
- Keep moving the fingers through their full range, so the scar doesn’t stick to what’s underneath
- Steroid injections are an option your doctor may offer for stubborn hypertrophic scars and keloids
A typical scar timeline
- Weeks 0 to 2: wound healing. Stitches out around 10 to 14 days
- Weeks 2 to 12: scar thickens and may feel lumpy. Massage and silicone start
- Months 3 to 6: softening and flattening
- Months 6 to 18: the scar keeps maturing, pales and becomes less noticeable
Get it checked if
- The lump is red, hot, swollen, weeping or discharging pus: same day
- You have a fever or red streaks up the arm: same day
- It’s getting bigger or more painful after the first few weeks
- It gives electric shocks that stop you using the hand
- A lump that was removed comes back
- The scar is tethering a finger so it can’t bend or straighten fully
For wound problems in the first weeks, see hand surgery wound: normal healing or infection, and hand infections.
Firm and quiet is scar. Red, hot and angry is infection.
Every article on this site is written using the Closing Window Method: name the window your condition runs on, find where you are in it, and act while it’s still open.