Easy... get an old paint brush - not too large - and snip off the brush-hairs leaving a short stump of about 5 mm height of so (try experimenting), it should look like a barber's shaving brush. Mix a darker shade of flesh paint and blot the paint off the brush tips onto a piece of waste paper. There should be just a small amount of paint on the brush tips. Attempt to create a 'speckle' effect with the whatever paint is on brush tip and you'll have 'freckles'. As usual, experiment first.
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