Hot spots on dogs appear as red, raw, wet-looking patches of skin that seem to emerge out of nowhere. They’re typically round or oval, clearly bordered against normal skin, and often oozing or glistening with moisture. The affected area may be swollen, warm to the touch, and sometimes covered in a yellowish or greenish discharge. Hair around the spot is usually matted, missing, or stuck down with dried fluid. These lesions can range from the size of a coin to several inches across, and they can grow noticeably within just a few hours.
The Telltale Visual Signs
The most recognizable feature of a hot spot is its moist, inflamed surface. Unlike dry, flaky skin conditions, hot spots look actively wet. The skin beneath is bright red or raw pink, and the edges are well-defined, creating a sharp line between the damaged area and the surrounding healthy skin. This clear border is one of the most reliable visual clues that you’re looking at a hot spot rather than a more diffuse skin problem.
You’ll often notice the hot spot before you can fully see it because the surrounding fur becomes matted and damp. Once you part or clip the hair away, the full extent of the lesion becomes visible, and it’s almost always larger than it first appeared. The surface may look shiny from serum (the clear fluid your dog’s body sends to inflamed areas), or it may be coated in a crusty, yellowish film if it’s been developing for a day or more. Some hot spots bleed slightly when touched or when your dog scratches at them.
How Hot Spots Develop and Spread
Hot spots typically start as a small area of irritation, often triggered by something that makes your dog scratch, lick, or chew at one spot repeatedly. Flea bites, allergies, ear infections, trapped moisture after swimming, and small wounds are all common triggers. The repeated trauma from your dog’s teeth or nails breaks the skin’s surface, and bacteria that naturally live on your dog’s skin invade the damaged area.
What makes hot spots alarming is their speed. A patch that was barely noticeable in the morning can double or triple in size by evening. The itch-scratch cycle drives this rapid expansion. The infection makes the skin itchier, which makes your dog chew at it more, which spreads the infection outward. In warm, humid weather, this cycle accelerates even further. Dogs with thick or long coats are especially vulnerable because moisture gets trapped against the skin under all that fur, creating an ideal environment for bacteria.
Where They Typically Show Up
Hot spots tend to appear in areas your dog can easily reach with their mouth or hind legs. The head and cheeks (especially just below the ears), the hip and thigh area, and the base of the tail are the most common locations. The spot’s location often hints at the underlying cause. A hot spot near the ear frequently points to an ear infection that’s making your dog scratch at the side of their face. One near the base of the tail often suggests fleas. Hot spots on the legs or paws may develop from allergies or boredom-related licking.
Dogs with drop ears, like Golden Retrievers and Cocker Spaniels, are especially prone to hot spots on the cheek and neck because their ear shape traps warmth and moisture. Breeds with thick double coats, including Newfoundlands, German Shepherds, and Golden Retrievers, develop hot spots more frequently than short-coated breeds.
Hot Spots vs. Other Skin Conditions
Several skin problems can look similar at first glance, but hot spots have distinguishing features. Ringworm causes hair loss in roughly circular patches, but the skin underneath tends to look dry and scaly rather than wet and oozing. Ringworm lesions also spread more slowly and lack the dramatic moisture that defines a hot spot.
Mange causes hair loss and irritated skin as well, but it tends to affect larger, more widespread areas rather than creating one distinct, well-bordered lesion. Mange-related hair loss is often more gradual and may appear on the ears, elbows, or face in patterns that look different from the sudden, localized eruption of a hot spot. The key visual difference across all these conditions comes back to moisture: hot spots are distinctly wet and inflamed, while most other common skin problems present drier.
When a Hot Spot May Be Something Deeper
Roughly 30 percent of dogs brought to a veterinarian for what looks like a hot spot actually have a different or more serious skin condition underneath. Hot spots on the cheek just below the ear are particularly notorious for masking a deeper skin infection beneath the surface, especially in Golden Retrievers. A deeper infection may look similar on top but feels thicker or more swollen, responds poorly to basic cleaning, or keeps coming back in the same spot.
Signs that a hot spot may be more than surface-level include significant swelling beyond the visible wound, a foul smell, streaks of redness extending outward from the edges, or a lesion that doesn’t start improving within a couple of days of being cleaned and kept dry. Multiple hot spots appearing at the same time can also signal a systemic issue like widespread allergies or a hormonal imbalance rather than a simple localized infection.
What Healing Looks Like
Once the cycle of licking and scratching is broken and the infection is addressed, hot spots follow a fairly predictable healing pattern. The weeping stops first, usually within a day or two. The bright red color fades to pink, and a dry scab forms over the surface. Over the following week, the scab shrinks and eventually falls off to reveal new pink skin underneath. Hair regrowth in the area typically takes a few weeks longer, and the new fur may initially come in a slightly different texture or shade before returning to normal.
Keeping the area clean, dry, and exposed to air is essential during this process. Clipping the fur around the hot spot helps it dry out and lets you monitor healing. An Elizabethan collar (the “cone of shame”) or a recovery suit prevents your dog from restarting the lick-scratch cycle, which is the single most important step in letting the skin recover. Most straightforward hot spots resolve within 7 to 10 days with proper care.