If they are on the coat and do not move unless the all of the fur moves then that's the coat and its fine. If it moves around then its probably fleas or some other insects on them. You can take them to the vets ifyou are concerned enough.
A black guinea pig would have a black coat color, while a white guinea pig would have a white coat color. Color variation in guinea pigs is due to different alleles of the gene controlling coat color, resulting in different phenotypes.
A test cross with a homozygous recessive guinea pig (bb) would reveal the genotype of the black guinea pig. If all offspring are black, then the black guinea pig is most likely homozygous dominant (BB). If both black and white offspring are produced, then the black guinea pig is likely heterozygous (Bb).
A single coloured guinea pig is called a self. (a guinea pig that is all black, white brown,etc)
The black guinea pig is likely heterozygous (Bb) for coat color, while the white guinea pig is homozygous recessive (bb). The black guinea pig passes on a black allele to all offspring, resulting in 4 black (Bb) and 2 white (bb) offspring.
Sooty
What i do to bathe my guinea pig is to get a large bowl, a sink, or the bathtub and put about 5 or 6 inches of water in (maybe even less then that) Then put in one tiny squeeze of guinea pig shampoo just so there is tiny bubbles around the side of the tub you are using.Use a soft cloth or your hands to bathe your guinea pig. Hold your guinea pig to make it feel secure,it won't drown, and it won't run away. Then gently and thoroughly dry off your guinea pig when finished.
4 offsprings
If your cat recently had fleas and your guinea pig has black dots on its skin, they could be flea eggs.
The bugs are fleas. Buy a flea powder and sprinkle the guinea pig according to the directions.
Tiny white spots on a guinea pig could be a sign of fungal infection such as ringworm. It's important to have a veterinarian examine the spots to provide a proper diagnosis and treatment plan. Keep your guinea pig's living area clean and dry to prevent further skin issues.
Cross between homozygous black rough (BBRR) guinea pig and homozgous white smooth guinea pig (bbrr) produced black and rough animals in F1 generation.
That's just about how big a female guinea pig gets. They may get a tiny bit bigger, but not by much My boy guinea pigs are a bit bigger. My friend's guinea pig which is a girl is small too.