The stall’s female owner and a male customer were among the three people killed, police said. The bomb blew off chunks of the market’s corrugated tin roof and wrecked nearby stalls.
The southern provinces have seen hundreds of attacks since 2004, many of them deadly, but there had been fewer violent incidents of late.
Analysts who monitor the conflict say violence from the insurgency fell to an historic low in 2017 despite the fact that talks aimed at bringing peace gained little traction.
Thailand’s military government has tried to revive talks with rebel groups initiated by the previous civilian government, but they have gone almost nowhere.
Resistance to Buddhist rule from Bangkok has existed for decades in the predominantly Muslim southern provinces, waning briefly in the 1990s before resurfacing violently in 2004.
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